Pieris Pharmaceuticals, Inc. General form of registration statement for all companies including face-amount certificate companies

General form of registration statement for all companies including face-amount certificate companies

Stockholders equity - Additional Information (Detail)

Stockholders equity - Additional Information (Detail)	12 Months Ended												12 Months Ended
Stockholders equity - Additional Information (Detail)	Dec. 31, 2013 USD ($)	Dec. 31, 2008 EUR (€)	Sep. 30, 2014 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2008 USD ($)	Dec. 31, 2013 Series A Preferred Stock [Member] USD ($)	Dec. 31, 2012 Series A Preferred Stock [Member] USD ($)	Dec. 31, 2011 Series A Preferred Stock [Member] USD ($)	Dec. 31, 2013 Series A 1 Preferred Stock [Member] USD ($)	Dec. 31, 2012 Series A 1 Preferred Stock [Member] USD ($)	Dec. 31, 2011 Series A 1 Preferred Stock [Member] USD ($)	Dec. 31, 2013 Series B Preferred Stock [Member] USD ($)	Dec. 31, 2012 Series B Preferred Stock [Member] USD ($)	Dec. 31, 2011 Series B Preferred Stock [Member] USD ($)
Common stock, shares issued	59,993us-gaap_CommonStockSharesIssued		59,993us-gaap_CommonStockSharesIssued	59,993us-gaap_CommonStockSharesIssued
Common stock, outstanding	59,993us-gaap_CommonStockSharesOutstanding		59,993us-gaap_CommonStockSharesOutstanding	59,993us-gaap_CommonStockSharesOutstanding
Common stock	$ 53,889us-gaap_CommonStockValue		$ 53,889us-gaap_CommonStockValue	$ 53,889us-gaap_CommonStockValue
Preferred stock, shares authorized	919,708us-gaap_PreferredStockSharesAuthorized		919,708us-gaap_PreferredStockSharesAuthorized	919,708us-gaap_PreferredStockSharesAuthorized			324,313			132,432			462,963
Preferred stock, share capital	585,007us-gaap_StockholdersEquity		(4,769,355)us-gaap_StockholdersEquity	495,702us-gaap_StockholdersEquity	2,822,229us-gaap_StockholdersEquity		378,503	378,503	378,503	173,896	173,896	173,896	662,515	662,515	662,515
Preferred stock, redemption terms	Holders of shares of preferred stock are entitled to receive a preference payment in the event of any liquidation, dissolution, winding-up or exit event (i.e., any merger or consolidation into or any other corporation or sale of more than 70% of Pieris AG's assets or 50% of Pieris AG's shares) of Pieris AG before any payment is made to the holders of shares of Pieris AG's common stock.
Exit event, preferred stock annual cumulative interest													8.00%
Preferred stock, dividend	0us-gaap_DividendsPreferredStock
Treasury stock, par value		€ 1.00
Deferred payment to capital reserve	$ 121,801		$ 121,801	$ 121,801		$ 48,690